For the University of Michigan, Miller appeared in 15 games for the Wolverines throwing 19.1 innings and earning the first win of his collegiate career. He made his debut against Canisius in February, where he threw two innings and allowed a lone hit. Miller was impressive from the get-go, not allowing a run until his seventh appearance of the year.

As a high school athlete, Miller earned All-County First Team honors in 2014 as well as Santa Cruz County Athletic League Pitcher of the Year. In his senior season, Miller had a record of 8-1 with a microscopic 1.27 ERA over 68 innings where he struck out 67 batters.